package com.atguigu.lease.web.admin.service.impl;

import com.atguigu.lease.common.constants.RedisConstant;
import com.atguigu.lease.common.exceptions.LeaseException;
import com.atguigu.lease.common.result.ResultCodeEnum;
import com.atguigu.lease.common.utils.JwtUtil;
import com.atguigu.lease.model.entity.SystemUser;
import com.atguigu.lease.model.enums.BaseStatus;
import com.atguigu.lease.web.admin.service.LoginService;
import com.atguigu.lease.web.admin.service.SystemUserService;
import com.atguigu.lease.web.admin.vo.login.CaptchaVo;
import com.atguigu.lease.web.admin.vo.login.LoginVo;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.wf.captcha.SpecCaptcha;
import org.apache.commons.codec.digest.DigestUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.util.ObjectUtils;

import java.util.UUID;
import java.util.concurrent.TimeUnit;

@Service
public class LoginServiceImpl implements LoginService {

    @Autowired
    private RedisTemplate<String, Object> redisTemplate;
    @Autowired
    private SystemUserService systemUserService;

    @Override
    public CaptchaVo getCaptcha() {
        //1.生成验证码图片以及正确验证码
        //参数1： 长的像素
        //参数2: 高的像素
        //参数3： 字符的数量
        SpecCaptcha specCaptcha = new SpecCaptcha(130, 48, 4);
        //表示验证码字母数字混合
        specCaptcha.setCharType(SpecCaptcha.TYPE_DEFAULT);
        //2.将验证码存储到redis中
        //1234
        //不区分大小写,此方法转换位小写
        String code = specCaptcha.text().toLowerCase();
        //管理员登录前缀admin:login:+UUID.randomUUID()
        String key = RedisConstant.ADMIN_LOGIN_PREFIX + UUID.randomUUID().toString();
        //添加到redis中：将key，图形验证码值，验证图片的超时时间秒.
        redisTemplate.opsForValue().set(key, code, RedisConstant.ADMIN_LOGIN_CAPTCHA_TTL_SEC, TimeUnit.SECONDS);
        //3.将图片和key存到vo返回
        //图片字符串（base64） [图片： 本身是字节文件 -》 base64 -> 字符串 -》 json]
        String image = specCaptcha.toBase64();
        CaptchaVo captchaVo = new CaptchaVo(image, key);
        return captchaVo;
    }

    @Override
    public String login(LoginVo loginVo) {
        //1. 检验接收的验证码是否为null,不为null继续
        if(ObjectUtils.isEmpty(loginVo.getCaptchaCode())){
            throw new LeaseException(ResultCodeEnum.ADMIN_CAPTCHA_CODE_NOT_FOUND);
        }
        //2. 根据key判定redis的验证码是否过期
        String redisCode = (String) redisTemplate.opsForValue().get(loginVo.getCaptchaKey());
        if(ObjectUtils.isEmpty(redisCode)){
            throw new LeaseException(ResultCodeEnum.ADMIN_CAPTCHA_CODE_EXPIRED);
        }
        //3. 进行验证码对比，相等继续
        //equalsIgnoreCase不区分大小写  比较两个字符串是否相等
        if (!redisCode.equalsIgnoreCase(loginVo.getCaptchaCode())) {
            throw new LeaseException(ResultCodeEnum.ADMIN_CAPTCHA_CODE_ERROR);
        }
        //4. 根据账号进行数据查询，查到的数据不为null继续
        LambdaQueryWrapper<SystemUser> systemUserLambdaQueryWrapper = new LambdaQueryWrapper<>();
        systemUserLambdaQueryWrapper.eq(SystemUser::getUsername,loginVo.getUsername());
        SystemUser systemUser = systemUserService.getOne(systemUserLambdaQueryWrapper);
        if (ObjectUtils.isEmpty(systemUser)) {
            throw new LeaseException(ResultCodeEnum.ADMIN_ACCOUNT_NOT_EXIST_ERROR);
        }
        //5. 对比密码（密码加密处理）
        if (!systemUser.getPassword().equals(DigestUtils.md5Hex(loginVo.getPassword()))) {
            throw new LeaseException(ResultCodeEnum.ADMIN_ACCOUNT_ERROR);
        }
        //6. 检查账号是否被禁用
        if(systemUser.getStatus() == BaseStatus.DISABLE){
            throw new LeaseException(ResultCodeEnum.ADMIN_ACCOUNT_DISABLED_ERROR);
        }
        //7. jwtutils生成token返回即可
        String token = JwtUtil.createToken(systemUser.getId(), systemUser.getUsername());

        return token;
    }
}
